ROCKLAND, Maine — Rockland police said that the cause of a fire that caused minor damage to a residential garage Tuesday night will likely never be known.

Rockland Police Detective Sgt. Chris Young said that the detective division interviewed numerous people but was not able to determine the cause other than it was an unknown human element. Detective Russell Thompson said one person acknowledged having been smoking in the garage near a pile of wood but that could not be pinpointed as the cause.

The police department was called to the scene of the fire at 97 New County Road which was called in to the fire department at 6 p.m.

The fire was extinguished when crews arrived at the scene and damage was limited to some insulation inside the garage that is adjacent to the home, said Fire Chief Charles Jordan Jr. at the scene. A neighbor spotted the fire and used his own fire extinguisher to put out the flames, the chief said.

The fire chief said the police department’s detective division was contacted based on some information but declined to release the details.